Pyracantha vs firethorn

Pyracantha and firethorn both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pyracantha	Yes	No	No	No
firethorn	Yes	No	No	No

As nouns, Pyracantha and firethorn are synonyms defined as:

Pyracantha and firethorn: any of various thorny shrubs of the genus Pyracantha bearing small white flowers followed by hard red or orange-red berries

Other synonyms of Pyracantha include fire thorn, pyracanth.

Pyracantha (noun)	firethorn (noun)
any of various thorny shrubs of the genus Pyracantha bearing small white flowers followed by hard red or orange-red berries	any of various thorny shrubs of the genus Pyracantha bearing small white flowers followed by hard red or orange-red berries